Senior ML Engineer

Department: Engineering & Data

Location: Warsaw, Europe

Employment Type: FullTime

Our Mission and Vision

At Solidgate, our mission is clear: to empower outstanding entrepreneurs to build exceptional internet companies. We exist to fuel the builders — the ones shaping the digital economy — with the financial infrastructure they deserve. To achieve that, we’re on a bold path: to become the #1 payments orchestration platform in the world.

We believe the future of payments is shaped by people who think big, take ownership, and bring curiosity and drive to everything they do. That’s exactly the kind of teammates we want on board.

Were building the #1 payment orchestrator in the world — and the names behind us prove it. Our clients include Bolt, Ajax, Nova Post, Megogo and were a direct partner of Visa and Mastercard with a European acquiring license. Operating in 150+ markets, with a trusting partners like J.P. Morgan.

Solidgate is part of Endeavor — a global community of the world’s most impactful entrepreneurs. We’re proud to be the first payment orchestrator from Europe to join — and to share our expertise within a network of outstanding global companies.

About the Team and Role

This is a foundational hire on ML/AI direction at Solidgate — youll be one of the first engineers building the function from the ground up, working closely with the ML team to shape it.
Youll help stand up the ML/AI direction from scratch — on top of 20M+ orders and 100M+ transactions a month. The next big step is a realtime ML payment routing. Thats the space youll be building in.

Explore our technology stack ➡️ here.

What you’ll own

— Design and build core ML models and pipelines as part of a true greenfield direction, not a maintenance handover
— A real-time ML decisioning system with direct revenue impact
— Hands-on experimentation — from idea, through A/B testing, to production
— Integrations of cutting-edge AI technologies to drive innovation
— Close partnership with Product, Engineering, and the Data Platform team (who will help with data and MLOps) to solve hard modelling problems and build orchestrated training and analytics pipelines
— Clear communication of technical results to both engineers and cross-functional stakeholders

You’re a great fit if you have

— 4-5+ years in ML or Data Science, with hands-on production experience in classical predictive models (e.g. credit scoring, fraud, risk, recommendations, pricing)
— Track record of shipping ML models end-to-end, from idea to production, in a real product environment and being able to show their business impact in numbers (conversion, approval rate, losses, revenue)
— Strong data science fundamentals
— Hands-on experience with A/B testing and experimentation design
— Feature engineering on high-cardinality transactional data

— A driver mindset: you can walk into a greenfield space, figure out what to build, propose it, and own it through delivery
— Great communication skills and comfort working with a wide range of stakeholders

Nice to have

— Experience in fintech, payments, fraud, or risk
— Real-time / low-latency ML serving
— A masters or PhD in a quantitative discipline

Why Solidgate?

Founding direction. Youll help build the function, the team, and the standards from day one, working alongside the Head of ML

Great product. We’ve built a fintech powerhouse that scales fast. Solidgate isn’t just an orchestration player — it’s the financial infrastructure for modern Internet businesses. From subscriptions to chargeback management, fraud prevention, and indirect tax — we’ve got it covered. We hold EMI licence and are a direct Visa & Mastercard partner and sub-reseller.

Impact you can measure. Every prediction has a clear outcome — approved or declined — which makes payments one of the few domains where ML ROI is provable per transaction.

Scale. Youll work with 20M+ orders and 100M+ transactions monthly, 100+ payment methods and providers.

Top-tier tech team. Youll lead and learn alongside engineers who hold the bar high and ship at fintech scale.

Work from anywhere. Fully remote, no relocation required. We also have offices in Poland, Cyprus, and Ukraine.

💌 The Extras: 30+ days off, unlimited sick leave, free office meals, health coverage, and Apple gear to keep you productive. Courses, conferences, sports and wellness benefits — all designed for ideas, focus, and fun.

Tomorrow’s fintech needs your mindset. Come build it with us.

🫂 Know top talent? We’re always on the lookout. Refer someone for our role, and if they get hired, there’s a bonus waiting for you — simple as that.